HM-SpringBoot1.2【SpringBoot快速入门、快速构建SpringBoot工程、起步依赖原理分析】

SpringBoot快速入门

1、创建maven项目

2、导入springboot起步依赖

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>com.haifei</groupId>
 8     <artifactId>springboot1-helloworld</artifactId>
 9     <version>1.0-SNAPSHOT</version>
10 
11     <!--springboot工程需要继承的父工程-->
12     <parent>
13         <groupId>org.springframework.boot</groupId>
14         <artifactId>spring-boot-starter-parent</artifactId>
15         <version>2.1.8.RELEASE</version>
16     </parent>
17 
18     <dependencies>
19         <!--web开发的起步依赖-->
20         <dependency>
21             <groupId>org.springframework.boot</groupId>
22             <artifactId>spring-boot-starter-web</artifactId>
23         </dependency>
24     </dependencies>
25 
26 </project>

3、定义controller类

 1 package com.haifei.controller;
 2 
 3 import org.springframework.web.bind.annotation.RequestMapping;
 4 import org.springframework.web.bind.annotation.RestController;
 5 
 6 @RestController
 7 public class HelloController {
 8 
 9     @RequestMapping("/hello")
10     public String hello(){
11         return "hello springboot !";
12     }
13 
14 }

4、编写引导类

 1 package com.haifei;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 
 6 /**
 7  * 引导类：SpringBoot项目的入口
 8  */
 9 @SpringBootApplication
10 public class HelloApplication {
11 
12     public static void main(String[] args) {
13         SpringApplication.run(HelloApplication.class, args);
14     }
15 
16 }

5、启动测试

快速构建springboot工程

1、构建

2、自动生成的

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4 
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <parent>
 8         <groupId>org.springframework.boot</groupId>
 9         <artifactId>spring-boot-starter-parent</artifactId>
10         <version>2.5.3</version>
11         <relativePath/> <!-- lookup parent from repository -->
12     </parent>
13 
14     <groupId>com.haifei</groupId>
15     <artifactId>springboot2-init</artifactId>
16     <version>0.0.1-SNAPSHOT</version>
17     <name>springboot2-init</name>
18     <description>Demo project for Spring Boot</description>
19 
20     <properties>
21         <java.version>1.8</java.version>
22     </properties>
23 
24     <dependencies>
25         <dependency>
26             <groupId>org.springframework.boot</groupId>
27             <artifactId>spring-boot-starter-web</artifactId>
28         </dependency>
29         <dependency>
30             <groupId>org.springframework.boot</groupId>
31             <artifactId>spring-boot-starter-test</artifactId>
32             <scope>test</scope>
33         </dependency>
34     </dependencies>
35 
36     <build>
37         <plugins>
38             <plugin>
39                 <groupId>org.springframework.boot</groupId>
40                 <artifactId>spring-boot-maven-plugin</artifactId>
41             </plugin>
42         </plugins>
43     </build>
44 
45 </project>

 1 package com.haifei.springboot2init;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 
 6 @SpringBootApplication
 7 public class Springboot2InitApplication {
 8 
 9     public static void main(String[] args) {
10         SpringApplication.run(Springboot2InitApplication.class, args);
11     }
12 
13 }

 1 package com.haifei.springboot2init;
 2 
 3 import org.junit.jupiter.api.Test;
 4 import org.springframework.boot.test.context.SpringBootTest;
 5 
 6 @SpringBootTest
 7 class Springboot2InitApplicationTests {
 8 
 9     @Test
10     void contextLoads() {
11     }
12 
13 }

3、手动编写controller进行测试

 1 package com.haifei.springboot2init;
 2 
 3 import org.springframework.web.bind.annotation.RequestMapping;
 4 import org.springframework.web.bind.annotation.RestController;
 5 
 6 @RestController
 7 public class HelloController {
 8 
 9     @RequestMapping("/hello")
10     public String hello(){
11         return "hi springboot";
12     }
13 
14 }